臺灣博碩士論文加值系統

本文利用設置於海洋大學濱海建物頂樓的X-band微波雷達系統分析基隆海域之流場特性。藉由雷達回波訊號的傅立葉轉換分析與分散關係式的濾波，可以分析出空間解析度約200公尺的流場分布。藉由佈置於現場的資料浮標與ADCP交互驗證，證實了微波雷達觀測的波高與表面流速的合理性與正確性。

分析2012年8月至2013年4月近8個月的雷達影像，觀測到在基隆嶼東南方海面於乾潮底前後約1小時期間出現逆時針旋轉之渦流，其半徑約為一公里，歷時約2小時，除此，本文亦使用雷達平均回波影像監測基隆海檻上方的跳躍波痕，結果證實在漲、退潮時刻均會出現，漲潮時出現跳躍波痕導致之回波強於退潮時刻，不論是基隆嶼東南側的渦漩或海檻上的跳躍波痕，其生成機制都是受當地潮流與海檻地形交互作用所引起。本文雷達影像的分析結果顯示了在基隆海域深水區(約80 m)之平均流速僅約0.22 m/s，但在基隆海檻上的最大流速可達3 m/s，分析海檻上的流速分布得知最大流速發生於漲潮五分前後，出現在距離基隆嶼1.5公里，水深約20m處。分析垂直海檻測線上的流速分布得知，當流因漲潮從海檻東側向西側流去時會因流經海檻進而產生加速。

In this study, we investigate the current field of coastal water in Keelung using X-band microwave radar which setting ion National Taiwan Ocean University. The current field distribution with the spatial resolution of about 200 meters can be obtained from analyzing radar echo signal by Fourier transform analysis and filtering by dispersion relation. We arrange the radar data with ADCP data and on-site buoy data to confirm the rationality and correctness of microwave radar wave height and surface velocity.

The radar data is collected from August 2012 to April 2013 for analysis. The counterclockwise eddy with a radius of about one kilometer is found in south-east of Keelung Island around the end of the dry tide occurs during one hour. In addition, we found jump wave in average radar image on the Keeling is still during flood tide and ebb tide, and the flood tide is more obvious than the other. The mechanism of eddy and jump wave is the interaction between tide and bathymetry. The result of radar image analysis shows that the averaged current speed in deep water region near Keelung water (approximately 80m) is 0.22 m/s, the maximum current speed in Keelung sill is 3 m/s that occur in the fifth during flood tide at a distance of 1.5km to Keelung Island at depth of about 20km. According analyzing the velocity distribution on sea sill measuring line, we also fund that when current was affected by rising tide and flow from sea sill eastern to western, current would accelerate for thronging sea sill.

謝辭…………………………………………………………………………………………………i
摘要……………………………………………………………………………………………………ii
Abstract………………………………………………………………………………iii
目次…………………………………………………………………………………………………………………...…iv
圖目次…………………………………………………………………………………………………………………v
表目次……………………………………………………………………………………………………….…viii
第一章 前言……………………………………………………………………………………………………………1
1-1研究背景……………………………………………………………………1
1-2文獻回顧……………………………………………………………………2
1-3研究目的……………………………………………………………………3
第二章 微波雷達海象觀測原理…………………………………………………………..………………4
2-1雷達運作原理……………………………………………………………4
2-2雷達海況觀測系統………………………………………………………6
2-3 波與流分析方法….…………………………………………………………8
2-3-1 波浪解析.…………………………………………………………8
2-3-2 海流解析…………………………………………………………9
第三章 雷達觀測結果驗證…………………………………………………………12
3-1 現場驗證儀器介紹…………………………………………………12
3-2 雷達觀測波浪之驗證…………………………………………………14
3-3 雷達觀測海流之驗證……………………………………………………16
3-4 ADCP資料檢視……………………………………………………19
3-5 影響雷達觀測因子………………………………………………………25
第四章 基隆海域潮流特性……………………………………………………34
4-1基隆海域渦漩……………………………………………………………34
4-2基隆深水海域之流速分佈…………………………………………………38
4-3海檻上位置與流速分佈…………………………………………………40
4-3-1海檻上流速分佈…………………………………………………40
4-3-2垂直海檻側線流速分布……………………………………………44
4-4基隆海檻跳躍波痕………………………………………………………49
第五章 結論與建議………………………………………………………56
5-1結論…………………………………………………………….56
5-2 建議…………………………………………………………………57
參考文獻……………………………………………………………………………………………58
附錄………………………………………………………………………………….…………………………60

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